Relationship between rhapidosome and pyocin in Pseudomonas fluorescens.

Rhapidosomal rods released from strain 3~ of Pseudomonas JEuorescens appear to be polymerized sheaths of pyocin which had a structure like that of T-even phage tails. This conclusion was based on the following observations : ( I ) Morphologically the rods have the same structure and diameter as the contracted sheath of R-type pyocin. (2) They resemble the polysheath of T-even phages. (3) Antigenically they are similar to R-type pyocin. (4) They are usually induced together with R-type pyocin but not with %type pyocin.